Tube and coupling



. Aug. 10, 1943.

R. DORMAN TUBE AND COUPLING Filed Sept. 25, 1942 ing it more firmly into the groove and vention, this bead and, in fact, the tube generally, is resiliento and compressible to a degree sufficient to permit the manual insertion of the [end of the tube in the pre-formed passageway under compression, as illustrated in Figure 3, until; as shown in Figure l, thebead 6 has I reached the annular groove When it has reached this point, the "bead, and to some ex- .tent the wall of the tube, will expand outwardly 1 and, with the surfaces of the groove, form a tight seal along the line I, thereby eff ectively confining any fluid passing to and from the tank through the tube.

the rollededge of 'said'bead outwardly and a flexible plastic tubing having an end edge rolled on itself to form a peripheral cuff, expansible spring means enclosed insaid cuff for forcing wall: structure 'having a passageway there through, said passageway having an annular internal groove spaced inwardly from the opening Althoughthe natural resiliency of thebead and tube forms an effective seal where the fluidlis moving under low pressure, in the caseof fluids moving under high pressure it is desirable to'provide a tighter seal. This maybe done, asillus trated in Figures 5 and 6, by inserting in the bead 6 under tension a split ring spring B. "This typeof spring may be formed fromspring steel or like material and very eifectivelyincreases the pressure against the outer edge of the bead, forcthereby strengthening the seal; 7 v

, It will be quiteapparent from the foregoing descriptionthat the construction of the invention.

provides asimple but very eifectiveway'of form: ing a connection between a tube and a wall with-' out the useof fittings or similar expedients. Since the form of the inventiondescribed is the i 1 preferred form only, his possible that various changes and modifications may be made without departing from the spirit of the invention. Having fully described my inyention,-I claim: i I A tubing connection comprising alength of ""2L Ii1 combination, a length of flexible andl re isilient tubing having an end rolledon itself forming a bead and a wan; structure having a passage wa y" therethrcug'h said passageway ,having a 'flared opening-to faeilitatethe insertion of the end of the tubirig'fand an annular, groove disthereof for the receptionof the bead when the tubing end is inserted in the passageway, the expansion Offthe cufi edgef utwardly against the walls, of the groove providing a seal preventing the escape of fluids passing theconnection.

5. In combination a length of resilient plastic tubing having an end edge rolled on itself'to form aperipheral bead, a split'ring spring positioned between said rolled edge and the tube and a wall "structure having a passageway therethro'ugh;

V itate the insertion of'the beaded end of the tubsaidpassageway having a flared opening to faciling, and an annular groove disposed inwardly from the opening, the surfaceof the tubin'gbead cooperating with the surface of the said groove to provide a seal againstthe escape of 'fiuids pass eth us he tu is. 7;;

6. A new article of manufacture-consisting o. a length of flexible plastictubinghaving; an end edge rolled backwardon itself to form a periphj eral bead, and an expansible spring element associated'with the bead for expanding said head edge outwardly and providinga sealed connection when th'e tubing end; is positioned in ,an opening in a connecting element. s ,7; Aconnectormeans for attaching the end oi tubing in'cludinggthe tubing, said tubing being formedfromsa-plastic materialland having the material turnedat the end of;the tube to vform a cuff, an element including ashore for receiving the aforesaid end of the tube, said here having an annular groove therein, said bore being of less diameter than thediallietBfDf the cuff, and the groovesbeingof slightly, less diameter than the, e diameter, ofthe cuff, and said bore including a' ,flaredlopening forinsertion' of the tubing.

, MBLA coupling means consisting of ,aslengtiroi plastic tubing having a bead on itsencl, andan velementtowhich the tubing is attached, including, the grooveiin which .thebeading fits said beading adap-ted'to yield asthe end of the tubing posed inwardly from the opening, said groove be- I 1 ing adapted to" accommodate; the; bead on the tubing andtocooperattherewith to form a seal. 3. In a line forth'e transmission of fuel or the,

like a length of flexible plastic'tubing, a peripheral cuff formedat one end thereof and expansi-- ble spring means associatedwith saidouff for therebetween and, adaptedto ,exert .an outward expanding the .end of the tubegto prodnce'atighte er'seal between said end and a wall apertnrevor,

the like in which said end may be inserted.

1 4 A tubing connection comprising a lengthof is placed ,in connection with'the element and-to spring into place in the groove due to the inner ent elasticity of the plastic of whichthe'tubinglis,

formed.

A new, article of manufacture consisting. of. a length of resilient plastic tubing having an endedge rolled backward on itself to form a periph-v eral cufigsaid cuif havinga portion spacedfrom the Wall of the. tube:to providesanannular space expansible pressure-when: confined in a connect-- ingfielement;\to provide aseal between the tubing and the connectingelement;

JAcK R. DQRMANQ" 

